Sunday, May 26, 2019

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MAY 26, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERNIGHT THUNDERSTORM LEADING TO WARM DAY WITH INCREASING WINDS…

A passing overnight thunderstorm brought on 0.47 inches of rain
around 12:00 A.M. last night. This lead to this morning being
partially humid with dew points in the upper 50s  and a relative
humidity of 91% at the 7 A.M. observation. As the day went on
relative humidity began to decrease and winds started to increase
with a peak gust of 27 kts (31 MPH) west at 1243E. The high so far
today is 75F, 7 degree above the daily normal maximum of 68F. The
low since midnight is 49F, a degrees below the normal minimum of 50F

Today’s Observations:

7 A.M.
Weather: Scattered cirrus
Temperature: 60F; Dew Point: 57F; Wind: W at 11G17 kts
Sea-level pressure: 29.88 ins. Hg, rising, then falling
Visibility: 45 miles
6-hr Max temp: 62F
6-hr Min temp: 47F
24-hr Precip: 0.47 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 220 SCT 45 121/60/57/2611G17/988/ FEW CU ALQDS
FEW AC ALQDS DSNT HZ ALQDS 8/002 58005 70047 10080 10062 20047

10 A.M.
Weather: Scattered cirrus
Temperature: 64F; Dew Point: 61F; Wind: WNW at 10 kts,
Sea-level pressure: 29.88 ins. Hg, rising, then falling
Visibility: 50 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 50 121/64/61/2910/988/ FEW CU ALQDS
FEW AC ALQDS DSNT HZ ALQDS 8/004 50001

1 P.M.
Weather: Scattered cumulus, Scattered cirrus
Temperature: 84F; Dew Point: 62F; Wind: W at 18G27 kts,
Peak Wind: W 27 kts (31 MPH) @ 1243E
Sea-level pressure: 29.83 ins. Hg, falling, then more quickly
Visibility: 50 miles
6-hr Max temp: 84F
6-hr Min temp: 61F
6-hr Precip: 0.00 ins.
BHO SA 1755 35 SCT 50 SCT 250 102/84/62/2818G27/983/
PK WND 2827/43/ DSNT HZ ALQDS 8/204 58019 10084 20061

SUMMARY FOR SATURDAY, MAY 25, 2019

TEMPERATURE (DEGREES F)
MAX…..75   NORMAL…..68
MIN…..47   NORMAL…..50
MEAN….61   NORMAL…..59

DEPARTURE FROM 30-YEAR NORMAL…………………….1
TOTAL DEPARTURE FOR THE MONTH…………………..-54 [-2.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………4   DEPARTURE………-3
TOTAL HEATING UNITS FOR THE MONTH………….277   DEPARTURE……..+43
TOTAL HEATING UNITS FOR THE SEASON………..6178   DEPARTURE……..-91
TOTAL HEATING UNITS LAST SEASON TO DATE……5825   DIFFERENCE……+353

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH……………4   DEPARTURE………-10
TOTAL COOLING UNITS FOR THE SEASON…………..4   DEPARTURE………-12
TOTAL COOLING UNITS LAST SEASON TO DATE……..42   DEPARTURE……..-38

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..MISSING
AERO…………………….35 SSW  AT 11:43 P.M.
ASOS…………………….39 S    AT 11:43 P.M.
DAVIS……………………43 S    AT 11:42 P.M.  RMY 39
FASTEST MILE FOR YESTERDAY………………….29 SSW  AT 11:48 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….26 S    AT 11:50 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………29 S    AT 11:49 P.M.
AVERAGE WIND SPEED AND DIRECTION……………11.0 SSW
ASOS……………………11.7
DAVIS…………………..11.2 SSW [209 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.47  DEPARTURE…….-0.16
ASOS…………..0.49
TOTAL PRECIPITATION FOR THE MONTH……….3.74  DEPARTURE…….+0.53
ASOS…………..3.56
TOTAL PRECIPITATION FOR THE YEAR……….24.92  DEPARTURE…….+3.16
ASOS………….24.71

PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

05/01 57/40/49/-4/0.00/0.0/…/..           21 S   AERO 21 SSE  RMY 21
05/02 45/41/43/-10/0.02/0.0/…/..          21 NE  AERO 21 SSW  RMY 20
05/03 60/43/52/-1/…./…/…/..           23 S   AERO 23 S    RMY 22
05/04 54/46/50/-4/…./…/…/..           14 ENE AERO 14 ENE  RMY 17
05/05 52/44/48/-6/0.00/0.0/…/..           18 NE  AERO 20 NE   RMY N/A
05/06 58/44/51/-3/…./0.0/…/..           25 NE  AERO 26 ENE  RMY 24
05/07 72/41/57/+2/0.12/0.0/…/..           30 S   AERO 29 S    RMY 30
05/08 67/48/58/+3/0.00/0.0/…/..           20 NE  AERO 20 NE   RMY 19
05/09 60/43/52/-3/0.00/0.0/…/..           21 SE  AERO 21 E    RMY 22
05/10 61/46/54/-1/0.16/0.0/…/..           35 S   AERO 37 S    RMY 37
05/11 68/50/59/+3/…./…/…/..           26 NW  AERO M  M    RMY N/A
05/12 50/36/43/-13/0.68/…/…/..          30 ENE AERO M  M    RMY N/A
05/13 52/38/45/-11/…./…/…/..          35 E   AERO M  M    RMY 34
05/14 44/38/41/-16/…./…/…/..          26 NNE AERO M  M    RMY 25
05/15 58/40/49/-8/…./…/…/..           28 NW  AERO M  M    RMY 28
05/16 68/46/57/0/…./…/…/..            17 NW  AERO M  M    RMY 19
05/17 64/49/57/0/…./…/…/..     22 WNW AERO 21 WNW  RMY 25
05/18 72/49/61/+3/…./…/…/..           26 SSE AERO 25 SSE  RMY 29
05/19 69/50/60/+2/…./…/…/..           39 S   AERO 43 SSE  RMY 42
05/20 85/52/69/11/…./…/…/..     35 SW  AERO 40 SW   RMY 39
05/21 69/52/61/+2/0.00/…/…/..           40 NW  AERO 46 NW   RMY 45
05/22 68/49/59/0/0.00/…/…/..            32 NNW AERO 29 NW   RMY N/A
05/23 68/48/58/-1/…/…/…/..     36 SSW AERO 37 SSW  RMY 40
05/24 68/47/58/-1/…/…/…/..     47 NW  AERO 47 NW   RMY 51
05/25 75/47/61/1/…/…/…/..     M  M   AERO 35 SSW  RMY 39

Low temp since midnight is 48F; normal low is 50F

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR MAY 25
HIGH 91F IN 2007
LOW 37F IN 1967
PRECIP 3.73 INS IN 1967
PEAK GUST 83 MPH NE IN 1967 (RECORD FOR MAY)

RECORDS FOR MAY 27
HIGH 92F IN 1914
LOW 36F IN 1915
PRECIP 1.40 INS IN 1898
PEAK GUST 55 S IN 1956

TODAY’S REPORT PREPARED BY: Nicholas Rousseau